The pendulum probe is described. It is an instrumented device that penetrates polar ice sheets for remote measurements of geophysical parameters. It can only move downward by melt penetration; its instrumentation is permanently installed, sealed in the ice. The power requirements and operating costs are derived from the heat transfer analysis. The pendulum steering principle, which assures a vertical probe attitude and course, also explains its performance flexibility. The results from the first trials verify the probe’s feasibility and supply additional design information. The probe offers a unique opportunity for access to, and study of, the Antarctic Ocean waters under the Ross and Filchner ice shelves.

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